why is there so much casting in c code example

Example 1: casting in c

#include <stdio.h>
#include <stdlib.h>
int main(){
  int x = 7, y = 5;
  float z;
  z = (float)x / (float)y;   /*Here the value of z is 1.400000*/
  return 0;
}

Example 2: how to cast in c programming

(new_type) name_var;